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Solution
Oily wastewater
Release time:
2022-03-22 14:41
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Technical Introduction
The mechanical processing and steel smelting industries generate substantial oil‑containing wastewater during production, with annual discharges nationwide reaching tens of millions of tons. This wastewater typically contains 3–5% mineral oil, along with emulsifiers, fats, and other additives, exhibiting high oil content and elevated chemical oxygen demand (COD), making it difficult to separate or degrade. Conventional treatment methods often rely on the addition of demulsifiers to break emulsions; however, these approaches suffer from drawbacks such as excessive demulsifier consumption, poor demulsification efficiency, significant secondary pollution, and high operating costs.
By retrofitting and upgrading conventional oil‑containing wastewater treatment processes with ceramic membrane technology, suspended solids can be effectively removed. The permeate from the ceramic membrane system can be reused or subjected to further treatment, while the ceramic membrane concentrate is either outsourced for disposal or undergoes additional separation.
Process Flow Diagram
The process flow for treating oil-containing wastewater is shown in the figure below:
Project Showcase
After treatment with a ceramic membrane, the oil‑containing wastewater achieves nearly complete removal of suspended solids, and the effluent’s water content is reduced to below 5 mg/L.
The research institution approved by Nanjing is also an independent legal entity of the first professional research institute of Jiangsu Industrial Technology Research Institute Membrane Science and Technology Research Institute, which is positioned as the organizer of membrane material industry cultivation.
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